We repair cylinder heads

New, used, refurbished cylinder heads

The Cylinder Head

The cylinder head is the most important area to consider by the serious tuner. Cylinder heads will always be the key component of performance enhancement packages on any normally aspirated or diesel engines on motor cars, trucks / bakkies, SUVs as well as bikes. Its design has more bearing on the end result, performance-wise, than any other component of the high-performance engine on motor cars. There is no way in which high horsepower can be obtained if the head won’t flow efficiently, and in turn burn that air / fuel mixture efficiently. Many tuners go to extremes, cramming as much air into the cylinder as possible, only to have a combustion chamber that wont burn the mixture efficiently. Many tuners go to extremes, cramming as much air into the cylinder as possible, only to have a combustion chamber that wont burn the mixture efficiently. Airflow figures tell very little about how well a head has been modified. There is no point in getting a lot of mixture into an engine unless you can manage to burn it at the right time, and if you try too hard to get high flow figures, you can easily end up with a combustion chamber that won’t burn effectively. For more information, contact the SAC Branch in your area. A gas flow rig is an aid in head development, but it is possible to look at a port and decide whether or not air would like to flow through it. A port that is nice and straight and has no projections will generally flow well. Until recent times many engines had a head design so horrible that to create an improvement was relatively simple. It has always been thought that there is a direct relationship between high airflow numbers and high power output. In principle this theory sounds correct, but in practice it does not always work out that way. At one time a factory racing department picked the best high-performance heads off the production line for modification. After being ported, each head was flow checked. The heads that recorded the best results were kept for the factory racing team, and the supposedly inferior heads were sold to selected privateers. The interesting thing is that on the dyno, the engines with the heads that produced the best airflow figures actually recorded power outputs no better than engines with average flow heads. After this discovery the factory tested all their heads for power output, before any were released to the private teams, and they found that some of the “average” heads they had been selling produced the best power. If the valves are enlarged and the ports are hogged out to the limit, you will get big power. It is amazing how many people are trapped by this fallacy. The Conversion Misconception Most people seem to think that a cylinder head conversion means fitting a different head to a vehicle or modifying the original one beyond recognition, turning a perfectly running leisure vehicle into a racecar or a unreliable lumpy idling impossible to drive monster. Unfortunately this does happen out there but we at SAC have a completely different approach…

We work on most of the available vehicle brands in South Africa

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Bolt on exhausts

Gone are the days that you take your half a million-rand Bakkie to a corner exhaust shop for a cheap free flow exhaust. It’s fair to say that the bolt-on free flow exhausts of today at SAC have been revolutionized and are becoming more and more popular amongst the enthusiasts. It is no longer just a poorly welded and routed exhaust that rattles and knocks over every bump, it is a properly engineered, big bore, mandrill bent stainless steel-low restriction exhaust system.  It is manufactured in such a way to be a bolt-on fitment in a workshop with very little effort to ensure perfection. Seeing the exhaust system in its raw form, packed and laying on a shelf – it is clear to see that this is an export quality product that will be installed on your vehicle, and it will compliment without any doubt – the performance enhancement plug and play kit and or upgraded intercooler system in many ways – most of all the sound and power will be much improved.  The bolt-on exhaust system is routed along the exact same rout under your vehicle and hangs with similar brackets on the standard rubbers.  The heat protection that has been provided by the manufacturer under your vehicle to protect the undercarriage is still effective and useful with the fitment of these bolt-on exhaust systems. So, if you want the ultimate Bakkie performance enhancement package speak to our sales and service advisors about a bolt-on exhaust system. Contact us today for your free quotation.